also known as the Millennium Wheel, is the tallest (135 metres (443 ft))
Ferris wheel in Europe, and has become the most popular paid tourist
attraction in the UK, visited by over 3 million people a year.

Big Ben and the Houses of Parliament are visible in middle left,
Waterloo Station in lower left, and Charing Cross railway station is visible in
the upper right.

the wheel carries 32 sealed and air-conditioned passenger capsules attached
to its external circumference. Each capsule holds approximately 25 people,
who are free to walk around inside the capsule, though seating is also provided.
It rotates at 26 cm (10 in) per second (about 0.9 km/h (0.5mph) so that one
revolution takes about 30 minutes. The wheel does not usually stop to take on passengers:
the rotation rate is so slow that they can easily walk on and off the moving capsules
at ground level. It is, however, stopped to allow disabled or elderly passengers time
to embark and disembark safely.

from: Wikipedia